CVE-2026-71271

HIGH 8.5

Memos Webhook SSRF via 0.0.0.0 Reserved-IP Bypass

CVSS Score

8.5

EPSS Score

0.0%

EPSS Percentile

0th

Memos' webhook URL validation, isReservedIP (internal/webhook/validate.go), checks a candidate IP against a reservedCIDRs list that omits 0.0.0.0/8 and never calls ip.IsUnspecified — unlike the correctly implemented sibling function isInternalIP in internal/httpgetter/html_meta.go, which does.

CWE	CWE-918
Vendor	usememos
Product	memos
Published	Aug 5, 2026
Last Updated	Aug 10, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

Low

Availability

None

Affected Versions

usememos / memos

0 ≤ 0.29.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/usememos/memos github.com: https://github.com/usememos/memos/blob/main/internal/webhook/validate.go

Credits

Alibek Baxtiyorov